James Packer went crazy on a guy he suspected was making moves on Mariah Carey ... sources connected with Mariah tell TMZ.
Our Mariah sources say Packer grew jealous of her relationship with Bryan Tanaka -- her dancer and choreographer -- and the tension boiled over in June at Mariah's show.
We're told Bryan wasn't dancing that night due to an injury, so Packer thought it was weird he botherd to show up. Packer pulled Bryan into a room for a little mano a mano. Our sources say there was a ton of yelling, but it's unclear if it got physical.
We're told Packer was so crazed he used his casino ties -- he owns several in Australia and Asia -- to get Tanaka banned from Caesar's Palace, where MC performs. This photo of Bryan was circulated to security.
We're told Mariah didn't make a fuss because Bryan, who was nursing a knee injury, wasn't dancing. Mariah sources say she feared Packer. As we've reported, she thinks he's "mentally unstable."
Our Mariah sources think James got suspicious after she gave Bryan a lap dance -- a staple in her show -- during a May performance in South Africa.